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linux-sg2042/arch/arm/mach-omap1/id.c

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/*
* linux/arch/arm/mach-omap1/id.c
*
* OMAP1 CPU identification code
*
* Copyright (C) 2004 Nokia Corporation
* Written by Tony Lindgren <tony@atomide.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>
#define OMAP_DIE_ID_0 0xfffe1800
#define OMAP_DIE_ID_1 0xfffe1804
#define OMAP_PRODUCTION_ID_0 0xfffe2000
#define OMAP_PRODUCTION_ID_1 0xfffe2004
#define OMAP32_ID_0 0xfffed400
#define OMAP32_ID_1 0xfffed404
struct omap_id {
u16 jtag_id; /* Used to determine OMAP type */
u8 die_rev; /* Processor revision */
u32 omap_id; /* OMAP revision */
u32 type; /* Cpu id bits [31:08], cpu class bits [07:00] */
};
/* Register values to detect the OMAP version */
static struct omap_id omap_ids[] __initdata = {
{ .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
{ .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
{ .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
{ .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
{ .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
{ .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
{ .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
{ .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
{ .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
{ .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
{ .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
{ .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
{ .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
};
/*
* Get OMAP type from PROD_ID.
* 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
* 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
* Undocumented register in TEST BLOCK is used as fallback; This seems to
* work on 1510, 1610 & 1710. The official way hopefully will work in future
* processors.
*/
static u16 __init omap_get_jtag_id(void)
{
u32 prod_id, omap_id;
prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
omap_id = omap_readl(OMAP32_ID_1);
/* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730 */
if (((prod_id >> 20) == 0) || (prod_id == omap_id))
prod_id = 0;
else
prod_id &= 0xffff;
if (prod_id)
return prod_id;
/* Use OMAP32_ID_1 as fallback */
prod_id = ((omap_id >> 12) & 0xffff);
return prod_id;
}
/*
* Get OMAP revision from DIE_REV.
* Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
* Undocumented register in the TEST BLOCK is used as fallback.
* REVISIT: This does not seem to work on 1510
*/
static u8 __init omap_get_die_rev(void)
{
u32 die_rev;
die_rev = omap_readl(OMAP_DIE_ID_1);
/* Check for broken OMAP_DIE_ID on early 1710 */
if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
die_rev = 0;
die_rev = (die_rev >> 17) & 0xf;
if (die_rev)
return die_rev;
die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
return die_rev;
}
void __init omap_check_revision(void)
{
int i;
u16 jtag_id;
u8 die_rev;
u32 omap_id;
u8 cpu_type;
jtag_id = omap_get_jtag_id();
die_rev = omap_get_die_rev();
omap_id = omap_readl(OMAP32_ID_0);
#ifdef DEBUG
printk("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
printk("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
omap_readl(OMAP_DIE_ID_1),
(omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
printk("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0));
printk("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
omap_readl(OMAP_PRODUCTION_ID_1),
omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
printk("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
printk("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
printk("JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
#endif
system_serial_high = omap_readl(OMAP_DIE_ID_0);
system_serial_low = omap_readl(OMAP_DIE_ID_1);
/* First check only the major version in a safe way */
for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
if (jtag_id == (omap_ids[i].jtag_id)) {
system_rev = omap_ids[i].type;
break;
}
}
/* Check if we can find the die revision */
for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
system_rev = omap_ids[i].type;
break;
}
}
/* Finally check also the omap_id */
for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
if (jtag_id == omap_ids[i].jtag_id
&& die_rev == omap_ids[i].die_rev
&& omap_id == omap_ids[i].omap_id) {
system_rev = omap_ids[i].type;
break;
}
}
/* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
cpu_type = system_rev >> 24;
switch (cpu_type) {
case 0x07:
system_rev |= 0x07;
break;
case 0x03:
case 0x15:
system_rev |= 0x15;
break;
case 0x16:
case 0x17:
system_rev |= 0x16;
break;
case 0x24:
system_rev |= 0x24;
break;
default:
printk("Unknown OMAP cpu type: 0x%02x\n", cpu_type);
}
printk("OMAP%04x", system_rev >> 16);
if ((system_rev >> 8) & 0xff)
printk("%x", (system_rev >> 8) & 0xff);
printk(" revision %i handled as %02xxx id: %08x%08x\n",
die_rev, system_rev & 0xff, system_serial_low,
system_serial_high);
}
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